Preparation of Fe-Cr/HCA catalyst and its denitration performance at high temperature CO-SCR

Using CO for the selective catalytic reduction of NOx in boilers (CO-SCR) can significantly reduce flue gas treatment costs. This paper investigates the high-temperature performance of Fe-Cr composite catalysts supported on honeycomb ceramic alumina (HCA) for CO-SCR. By varying the bimetallic ratio, aging temperature, and loading amount, optimal material preparation conditions are determined. Experimental results demonstrate that the Fe-Cr/HCA catalyst exhibits excellent performance in the catalytic reduction of NO. When the Fe to Cr ratio is 1: 1, the aging temperature is 300°C, and the impregnation is performed 15 times, the Fe-Cr/HCA catalyst achieves the highest denitration performance, with NO conversion rates approaching 100% in the temperature range of 400°C to 800°C under the tested conditions. The catalyst surface forms a solid solution of FeCr2O4, with the synergistic effects of Fe2O3 and Cr2O3 enhancing denitration efficiency.

采用一氧化碳（CO）对锅炉内氮氧化物（NOₓ）进行选择性催化还原（CO-SCR）的工艺，可显著降低烟气处理成本。本文针对CO-SCR工艺，研究了负载于蜂窝陶瓷氧化铝（HCA）载体上的铁铬复合催化剂的高温催化性能。通过调控双金属配比、陈化温度与负载量，确定了该催化剂的最优制备工艺条件。实验结果表明，Fe-Cr/HCA催化剂在NO催化还原反应中展现出优异的催化性能。当铁铬配比为1:1、陈化温度为300℃且浸渍次数为15次时，Fe-Cr/HCA催化剂的脱硝性能达到最优，在测试条件下，400℃至800℃的温度区间内NO转化率接近100%。该催化剂表面形成了FeCr₂O₄固溶体，Fe₂O₃与Cr₂O₃的协同效应进一步提升了脱硝效率。